16
2.8
Loop stroke
The loop stroke is the path of the needle from its right reversal point to the point
where the tip of the large gripping finger stands above the centre of the needle.
(Figure 8)
2.8.1
Adjusting the loop stroke
Caution!
Switch off the machine electrically!
In the factory setting, the loop stroke is 2.3
–
3.0 mm.
(Figure 8)
Adjustment:
-
Unscrew the head of the connecting rod:
Loop stroke becomes smaller
-
Screw in the head of the connecting rod:
Loop stroke becomes larger
Thread slope = 0.5 mm per rotation
The following steps are required to rotate the head of the connecting rod
(figures 5 and 6)
:
1. Unscrew the fillister head screw
(9) figure 5
and push the gripper forwards.
2. Remove the nut
(5) figure 5
from the gripper shaft.
3. Remove the cylinder head screws
(4) figure 5
from the head of the
connecting rod
(3) figure 5
.
4. Remove the adjusting ring
(3) figure 6
and pull out the gripper shaft
including the head of the connecting rod
(3) figure 5
from the cross-beds
(5) figure 6
.
Do not remove the contoured bolt
(4) figure 6
!
The loop stroke can be determined using a special dial gauge or
vernier caliper.
Summary of Contents for BM 345
Page 1: ...PRODUCED BY INDUSTRIAL SEWING MASCHINES BM 345 Mechanic s Instrutions ...
Page 2: ...2 ...
Page 4: ...4 ...
Page 15: ...15 Figure 5 Figure 6 ...
Page 24: ...24 Figure 12 ...
